static Map<BufferedImage, O> createGraphics_modulators = synchroIdentityHashMap();

static Graphics2D createGraphics(BufferedImage img) {
  Graphics2D g = img.createGraphics();
  O mod = createGraphics_modulators.get(img);
  if (mod != null)
    callF(mod, g);
  ret g;
}

// mod: voidfunc(Graphics2D)
static void createGraphics_modulate(BufferedImage img, O mod) {
  mapPut2(createGraphics_modulators, img, mod);
}